> For the complete documentation index, see [llms.txt](https://mindcodeinteractive.gitbook.io/easy-build-system-old/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mindcodeinteractive.gitbook.io/easy-build-system-old/components/building-part/building-conditions.md).

# Building Conditions

All of the following conditions can be enabled directly from the [Building Part](/easy-build-system-old/components/building-part.md) components.

### Building Basics Condition

Checks all the essential conditions of the [Building Parts](/easy-build-system-old/components/building-part.md).

This condition is required and enabled by default for all [Building Parts](/easy-build-system-old/components/building-part.md) in the system.

### Building Collision Condition

Checks if the [Building Part](/easy-build-system-old/components/building-part.md) does not collide with undesirable colliders during preview mode.

Uses the model's bounds of the [Building Part](/easy-build-system-old/components/building-part.md) to detect collisions. It is possible to play with the "Collision Tolerance" field to avoid or no some colliders.

It is also possible to require a specific Building Collision Surface with a tag to allow placement only on this surface. This helps to reduce unwanted building placements, such as on props, etc.

### Building Physics Condition

Checks all the stability points of the [Building Part](/easy-build-system-old/components/building-part.md) are stable, otherwise gravity will be applied.

### Building Terrain Condition

Checks if the [Building Part](/easy-build-system-old/components/building-part.md) is not colliding with trees and can remove grass when at placement.

### Building NavMesh Condition

Enables AI NavMesh Agents to avoid [Building Part](/easy-build-system-old/components/building-part.md)[s](/easy-build-system-old/components/building-part.md) by using the built-in NavMeshObstacle component based on the model bounds.


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